Category: Podcast

E08: How 2 be a snake

Podcast, Uncategorized

Imagine you and a stranger are paired together for a little game. Now there’s some money up for grabs and you’re both given 2 choices; Share or Snake.

If you both share you both win £15 each.
If one of you shares and one of you snakes, the snake will win £50 leaving the person who chose share with nothing.
If you both pick snake, you both leave with nothing.

Would you pick ‘snake’ in the hopes of taking a bigger prize for yourself, or would you pick ‘share’ to share a smaller prize!? What would you do? What should you do? And why should we even care?
In this episode, which is also the season finale, Bia shares some introductory game theory with Zoey by discussing:

The social-media experiment they both conducted through Instagram: “Snake or Share”
The Prisoner’s dilemma (which is the original problem)
The Traveller’s dilemma.

Acting like a “snake” i.e. picking the “dominant strategy” may give you control leaving you less susceptible to exploitation, but is it always the most profitable strategy? And what about the long-term implications of this?


Sodosage’s Instagram (poet): @sodosage

E07: How 2 create a dating app

Podcast, Uncategorized

How do dating apps work? And what are your thoughts on them? In this episode, Zoey shares how collaborative filtering works in dating apps such as Tinder, but also in Amazon. Bia shares how Hinge uses the Gale-Shapley algorithm (whilst butchering the pronunciation) to find your most compatible match. They discuss thoughts people shared via Instagram.

Further details of the maths and algorithms are shared via Instagram!

Time stamps:
0:47 – Collaborative filtering
13:55 – Gale Shapley algorithm
19:04 – Are dating apps are good/bad thing? Thoughts of Instagram followers
28:48 – Who do dating apps favour/ hinder? Thoughts of Instagram followers & some personal stories

Useful Links:

Hinge uses Gale-Shapley algorithm
Judith DuPortail’s article
Interracial dating online

E06: How 2 illustrate a scientist with Nina Chhita

Podcast, Uncategorized

In light of International Women’s Day 2021, Zoey and Bia interview Nina Chhita, a medical writer based in Canada. Nina brings together art and science by illustrating trailblazers in science who happen to be women. 

00:10 Introduction
02:09 Quick fire quiz
03:15 What does it mean to be a medical writer?
05:31 Did you always want to study biology when you were younger?
08:10 Who were your role models growing up?
11:39 Which blue plaque story led to @science.unhinged and @nina.draws.scientists?
14:59 What was it about Rosalind Franklin that drew you to her story?
6:15 How do you get inspiration for the scientists you illustrate now?
18:26 How easy is it to find misinformation about less well-known women?
20:30 Which scientist you’ve illustrated has been most fascinating to you?
23:42 Has anything surprised you on this journey of science communication?
26:26 What are ways we can feature women in science to be more mainstream?
32:40 What would you change about the current curriculum to encourage girls to take more STEM-based subjects?
33:40 How much more progress do we need in the future and how do you think we can get there?
35:34 What makes a good scientist in your opinion?
37:45 What is planned next for nina.draws.scientist?

Connect with Nina Chhita on Instagram @nina.draws.scientists and on Twitter @Nina_Chhita.

E05: Q&A

Podcast

In this episode, Zoey and Bia answer questions submitted by listeners. These include what inspired them to make the podcast, Instagram page and blog, why a common person should learn maths, and how hard it is to get good at it.

Timestamps:
00:36 What inspired you to make this page and podcast?
02:00 Who are we?
02:49 How did we meet?
03:37 What inspired you to take maths at university?
04:38 What advice would you give yourself if you could go back in time 10 years?
05:25 What advice would you give to young girls who want to pursue STEM (Science, Technology, Engineering and Mathematics)?
06:30 Why do you think a common person should learn maths?
09:39 How hard is it to get good at maths?
12:40 What is missing from elementary school maths syllabus that would make maths more fun?
14:13 Are mathematical models underrated or overrated?
16:37 Do you have any maths book recommendations?
18:10 Does it annoy you that people think you are men online?
20:18 From your experience, what have you learnt about communicating maths ideas online?

Useful links:
https://www.opendemocracy.net/en/5050/these-women-are-using-instagram-celebrate-unsung-women-science/

E04: How 2 lie with zombie statistics

Podcast, Uncategorized

Zoey and Bia discuss what zombie statistics are, why it’s hard for zombie statistics and facts to die and whether it is right for a wrong statistic to be cited even if it produces positive effects.

Introduction
00:15 – Lies, damned lies and statistics
01:48 – Zombie statistics definition
Quiz and answers discussion
03:52 – Zombie stats or facts quiz
05:45 – Zombie stat/fact #1 – One in four people will suffer from mental illness/ depression in their lifetime
09:18 – Zombie stat/fact #2 – You need to drink eight glasses of water a day
12:18 – Zombie stat/fact #3 – People use only 10% of their brains
14:22 – Zombie stat/fact #4 – You need to walk 10,000 steps a day to stay healthy and fit
19:05 – Zombie stat/fact # 5 – The ban of plastic straws will massively reduce plastic waste in our oceans
General discussion
26:26 – Discussion on why it’s hard for zombie stats/facts to “die” – beneficial information to people/companies and confirmation bias?
30:37 – Is it okay for a statistic to be wrong even if it has a positive effect?
33:45 – Making sure you understand the entire story of the statistic and taking it with a pinch of salt
35:29 – Conclusions

Useful links:
Adult Psychiatric Morbidity in England – 2007, Results of a household survey https://digital.nhs.uk/data-and-information/publications/statistical/adult-psychiatric-morbidity-survey/adult-psychiatric-morbidity-in-england-2007-results-of-a-household-survey
Medical Myths” https://www.bmj.com/content/335/7633/1288
Dirty Streaming: The Internet’s Big Secret https://www.bbc.co.uk/iplayer/episode/p083tb16/dirty-streaming-the-internets-big-secret

E03: How 2 rig an election

Podcast

Bia and Zoey discuss some of the key mathematical concepts in voting, focusing on political elections in some Western countries, as well as Brexit.

Introduction
0:15 – Introduction on the voting system in the UK, with an example
4:27 – Condorcet’s paradox 6:00 – The French system
6:44 – The Australian system – Preferential/Alternative voting
7:42 – What defines a good voting system?
9:43 – How do we balance a good voting system with one which everyone understands
Arrow’s Impossibility Theorem & Instagram poll
11:40 – Arrow’s Impossibility Theorem
13:46 – Independent voting systems where Arrow’s theorem doesn’t apply.
15:00 – Instagram poll discussion: Tactical voting vs Voting for who you want
17:31 – Protest voting vs voting for who you want
20:20 – When it would be worth strategically voting “mathematically”
Brexit21:22 – Zoey exposing Bia as a “Remoaner”
22:50 – How Bia think the referendum should have been done. General discussion
24:05 – Have you ever not voted?
26:12 – Should 16 year olds be allowed to vote? 2
27:29 – Accessibility in a voting system
The future of voting
27:54 – The future of voting
28:52 – The issues with a voting system which takes too long (NP-hard/ NP-complete)
30:00 – Dodgson’s voting method (Lewis Carroll = Charles Dodgson)
32:52 – Final thoughts

80% of voters are strategic: “Counting Votes Right: Strategic Voters versus Strategic Parties, Filippo Mezzanotti and Giovanni Reggiani” http://economics.mit.edu/files/11177

E02: How 2 predict grades badly…

Podcast

In this episode, we discuss some of the mistakes that Ofqual made in their algorithm, how using “complicated” maths is not necessarily better, and share some anecdotes of their experiences with teachers and dealing with (un)conscious bias.

Timestamps
00:20 – Introduction
01:54 – Initial thoughts
02:42 – Mistake #1 – Their approach
04:43 – Mistake #2 – Data leakage
05:15 – Mistake #3 – Emphasis on the rank
06:57 – Mistake #4 – Ignoring outliers
08:31 – Mistake # 5 – No peer review
09:16 – Mistake #6 – Too precise
11:14 – Mistake #7 –Disregarded unconscious bias.
12:53 – Mistake #8: Education system in the UK.
13:30 – Ofqual considered edge cases – (almost a positive thing!)
15:00 – How we might have handled this situation
17:39 – Another example of algorithmic bias – Accounting system the Post Office used.
18:53 – Challenge: “Prison Break”. This based on “Liar’s paradox” attributed to Epimenides (amongst many other philosophers). For more challenges, presented in a more visual manner, check out our Instagram.
25:52 – Anecdotes of experiencing bias from teachers.

Useful links:
Ofqual’s reportBristol University’s study on unconscious bias 
http://www.bris.ac.uk/media-library/sites/cmpo/migrated/documents/wp221.pdfTom SF Haines’ post (Lecturer in Machine Learning at Bath University) – http://thaines.com/post/alevels2020

E01: How 2 make a decision ft. The Monty Hall Problem

Podcast

What makes a good decision? Do you think decisions are good if they were good enough at the time, or does the outcome shape your idea?

Known for its controversy, The Monty Hall Problem was popularised through a newspaper column called Ask Marilyn. In this episode, we discuss how probability can help us make a decision in The Monty Hall Problem as well as more generally. We also try to define the “wrong decision” and the circumstances under which we might regret our choices. Does the outcome of your decision imply how good it was in the first place? Later on, we briefly venture into numbers and how our minds don’t always perceive things correctly. Finally, we discuss The Two- Envelope Paradox and how the assumptions we make can lead us to the wrong conclusions.

Useful links to understanding The Monty Hall Problem: V Sauce’s video on the Monty Hall Problem. An article to help explain.

The Envelope Problem explained:https://plus.maths.org/content/two-envelopes-problem-resolutionhttps://brilliant.org/wiki/two-envelope-paradox/

This episode was recorded on 16th June 2020.